(57) An inverter unit includes a DC power source, an inverter circuit having two or more
pairs of switching elements which are connected in parallel to the DC power source,
so that a DC voltage of the DC power source is converted into a pulse train-like,
pseudo-AC voltage output from the inverter circuit, and a PWM generator connected
to the inverter circuit for adjusting the pseudo-AC voltage by pulse width modulation.
Further, the inverter unit includes a voltmeter for detecting an actual, output voltage
which is output from the inverter circuit, and a duty cycle controller for controlling
an output duty cycle, so that the detected, actual, output voltage becomes a target
output voltage. In this inverter unit, a desirable, output voltage may be obtained
stably and accurately even if a voltage of a power source fluctuates.
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